Process for fabricating a hermetic glass-to-metal seal
US5709724A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 4, 1994 |
| Grant date | Jan 20, 1998 |
| Priority date | — |
| Expiry date | Aug 4, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03C27/02
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A process for forming a hermetic glass-to-metal seal between a conductive pin and an outer body, wherein a corrosion-resistant noble metal (e.g., gold) coating is applied to the conductive pin before the hermetic seal is formed. The process generally includes providing a noble metal-coated conductive pin, placing glass having a softening point less than about 650.degree. C. into a cavity of the outer body, inserting the coated conductive pin into a bore in the glass preform, heating the assembly to a temperature in excess of the softening point of the glass but less than about 700.degree. C., and cooling the assembly. The coefficients of thermal expansion of the components of the assembly are preferably selected such that the resulting assembly is a hermetic compression seal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.